Zoul Generic ADC interface

Files
file	adc-zoul.c
	Generic driver for the Zoul ADC interface.
file	adc-zoul.h
	Header file for the Zoul ADC interface.

Functions
static int	configure (int type, int value)

Generic ADC sensors
#define	ZOUL_SENSORS_ADC_MIN   2
	PA1 pin mask.

Detailed Description

Driver for the Zoul ADC interface

This driver supports analogue sensors connected to ADC1, ADC2, ADC3, ADC4, ADC5 and ADC6 inputs. ADC6 is shared with the user button, so disable user button if ADC6 is needed. This is controlled by the type argument of the value() function. Possible choices are:

• ZOUL_SENSORS_ADC1
• ZOUL_SENSORS_ADC2
• ZOUL_SENSORS_ADC3
• ZOUL_SENSORS_ADC4
• ZOUL_SENSORS_ADC5
• ZOUL_SENSORS_ADC6

To initialize the ADC sensors use the configure() function, using as first argument SENSORS_HW_INIT, and choose which ADC channels to enable passing as second argument any single or combined (sum) values as below:

• Either use multiple values (i.e ZOUL_SENSORS_ADC1 + ZOUL_SENSORS_ADC2)
• ZOUL_SENSORS_ADC_ALL (all channels above)

Using an invalid combination will return ZOUL_SENSORS_ERROR.

The decimation rate can be set by passing ZOUL_SENSORS_CONFIGURE_TYPE_DECIMATION_RATE as the type argument to the configure() function and then specifying the rate through the value argument. Valid values are:

• SOC_ADC_ADCCON_DIV_64 (64 bit rate)
• SOC_ADC_ADCCON_DIV_128 (128 bit rate)
• SOC_ADC_ADCCON_DIV_256 (256 bit rate)
• SOC_ADC_ADCCON_DIV_512 (512 bit rate)

Function Documentation

configure()

static int configure ( int type, int value )

static

< PA1 pin mask

Definition at line 131 of file adc-zoul.c.

References adc_init(), ADC_SENSORS_ADC1_PIN, ADC_SENSORS_ADC2_PIN, ADC_SENSORS_ADC3_PIN, ADC_SENSORS_ADC4_PIN, ADC_SENSORS_ADC5_PIN, ADC_SENSORS_ADC6_PIN, configure(), GPIO_A_BASE, GPIO_A_NUM, GPIO_SET_INPUT, GPIO_SOFTWARE_CONTROL, IOC_OVERRIDE_ANA, ioc_set_over(), SOC_ADC_ADCCON_DIV_512, and ZOUL_SENSORS_ADC_MIN.

Referenced by configure().